Composition including an additive to sulphamate electrolytes for depositing hard nickel layers and method of using same

Abstract

There is added to sulphamate electrolytes for depositing hard nickel layers based on nickel sulphamate an additive comprising of boric acid, nickel chloride and a surface-active substance which represents a derivative of sulphamoylbenzoic acid with the general formula ##STR1## in which X and Y are hydrogen, halogen, ##STR2## alkyl radical or a mixture of these compounds in a concentration from 0.1 to 4 g/l. These hard nickel layers are used in the manufacture of matrices for different work-pieces.

We claim: 
     
       1. Sulphamate electrolyte for electrodepositing hard nickel layers, said electrolyte being based on nickel sulphamate, boric acid, nickel chloride, and a surface-active additive which represents a derivative of sulphamoylbenzoic acid with the general formula ##STR5## in which X an Y are chosen from a group consisting of hydrogen, halogen, ##STR6## alkyl radical and a mixture of these compounds in a concentration from 0.1 to 4 g/l. 
     
     
       2. An electrolyte for electrodepositing hard nickel layers with the following composition:   ______________________________________                                    
               g/l                                                        
______________________________________                                    
nickel sulphamate                                                         
                 350                                                      
boric acid       36                                                       
nickel chloride  3                                                        
alkylethersulphate                                                        
                 0.1                                                      
______________________________________                                    
     and a surface-active additive which represents a derivative of sulphamoylbenzoic acid with the general formula ##STR7## in which X and Y are chosen from a group consisting of hydrogen, halogen, ##STR8## alkyl radical and a mixture of these compounds in a concentration from 0.1 to 4 g/l.   
     
     
       3. An electrolyte for electrodepositing hard nickel layers with the following composition:   ______________________________________                                    
                    g/l                                                   
______________________________________                                    
nickel sulphamate     350                                                 
boric acid             36                                                 
nickel chloride        3                                                  
alkylethersulphate    0.1                                                 
2, 4 dichloro-5 sulphamoylbenzoic                                         
                      0.75                                                
acid                                                                      
______________________________________                                    
     
     
     
       4. An electrolyte for electrodepositing hard nickel layers with the following composition:   ______________________________________                                    
                         g/l                                              
______________________________________                                    
nickel sulphamate          350                                            
boric acid                  36                                            
nickel chloride             3                                             
nonylphenolether           0.1                                            
2, 4 dichloro-5-sulphamoyl-6-furanyl benzoic acid                         
                           1.5                                            
______________________________________                                    
     
     
     
       5. Method of electrodepositing hard nickel layers comprising employing an electrolyte based on nickel sulphamate, boric acid, nickel chloride and a surface-active additive representing a derivative of sulphamoylbenzoic acid with general formula ##STR9## in which X and Y are chosen from a group consisting of hydrogen, halogen, ##STR10## alkyl radial and a mixture of these compounds in a concentration from 0.1 to 4 g/l. 
     
     
       6. Method of electrodepositing hard nickel layers comprising employing an electrolyte having the following composition:   ______________________________________                                    
                    g/l                                                   
______________________________________                                    
nickel sulphamate     350                                                 
boric acid             36                                                 
nickel chloride        3                                                  
alkylethersulphate    0.1                                                 
2, 4 dichloro-5 sulphamoylbenzoic                                         
                      0.75                                                
acid                                                                      
______________________________________                                    
     
     
     
       7. Method of electrodepositing hard nickel layers comprising employing an electrolyte with following composition:   ______________________________________                                    
                         g/l                                              
______________________________________                                    
nickel sulphamate          350                                            
boric acid                  36                                            
nickel chloride             3                                             
nonylphenolether           0.1                                            
2, 4 dichloro-5-sulphamoyl-6-furanyl benzoic acid                         
                           1.5                                            
______________________________________